Find the area of the blades of the magnetic compass shown in Fig. 12.27. (Take = 3.32).
Answers
area of the blades of the magnetic compass = 4.98 cm²
Step-by-step explanation:
see attached picture for magnetic compass
area of the blades of the magnetic compass
= area of two triangle
Triangle has sides 5 , 1 , 5
s = (5 + 1 + 5)/2 = 11/2
Area of one triangle = √(11/2)(11/2 - 5)(11/2 - 1)(11/2 - 5)
= √(11/2)(1/2)(9/2)(1/2)
= 3√11 / 4
√11 = 3.32 given
= 3 * 3.32 /4
Area of both triangles = 2 * 3 * 3.32 /4
= 3 * 3.32 /2
= 3 * 1.66
= 4.98 cm²
area of the blades of the magnetic compass = 4.98 cm²
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